<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../vue.js"></script>
</head>
<body>
    <div id="app">
        <button @click.once='doThis'>只执行一次</button>
    </div>
    <script>
        const app=new Vue({
            el:'#app',
            data:{},
            methods:{
                doThis(){
                    console.log("我是当前元素，只执行一次")
                }
            }
        });
    </script>
</body>
</html>